{"id":277775,"date":"2022-10-26T10:29:00","date_gmt":"2022-10-26T10:29:00","guid":{"rendered":"https:\/\/mahfoudhi.xyz\/ar\/?p=277774"},"modified":"2022-10-26T10:29:00","modified_gmt":"2022-10-26T10:29:00","slug":"la-recherche-montre-comment-le-stress-affecte-le-cerveau","status":"publish","type":"post","link":"https:\/\/realites.com.tn\/fr\/la-recherche-montre-comment-le-stress-affecte-le-cerveau\/","title":{"rendered":"La recherche montre comment le stress affecte le cerveau"},"content":{"rendered":"<p style=\"margin-bottom: 11px; text-align: justify;\"><span style=\"font-family:Arial,Helvetica,sans-serif;\"><span style=\"font-size:14px;\"><span style=\"line-height:107%\"><span style=\"background:white\"><span style=\"line-height:107%\"><span style=\"color:black\"><span style=\"letter-spacing:.4pt\">Nous avons tous subi les effets paralysants d&#39;un danger ou d&#39;une menace &agrave; un moment donn&eacute;.<\/span><\/span><\/span><\/span><br style=\"box-sizing:border-box; line-height:4.6rem; display:inline-block; font-variant-ligatures:normal; text-align:start; text-decoration-thickness:initial; text-decoration-style:initial; text-decoration-color:initial; margin-top:15px; margin-right:15px; margin-bottom:15px; margin-left:15px\" \/><br \/>\n<span style=\"line-height:107%\"><span style=\"color:black\"><span style=\"letter-spacing:.4pt\"><span style=\"background:white\">Des chercheurs de l&#39;Universit&eacute; de l&#39;Iowa ont d&eacute;termin&eacute; l&#39;origine de cette r&eacute;ponse &agrave; une menace.&nbsp;Selon une &eacute;tude r&eacute;cente, un circuit neuronal reliant deux r&eacute;gions c&eacute;r&eacute;brales distinctes contr&ocirc;le la fa&ccedil;on dont les animaux, y compris les humains, r&eacute;agissent aux situations stressantes.<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom: 11px; text-align: justify;\"><span style=\"font-family:Arial,Helvetica,sans-serif;\"><span style=\"font-size:14px;\"><span style=\"line-height:107%\"><span style=\"background:white\"><span style=\"line-height:107%\"><span style=\"color:black\"><span style=\"letter-spacing:.4pt\">Les scientifiques ont utilis&eacute; des exp&eacute;riences pour d&eacute;montrer comment les rats r&eacute;agissaient aux menaces de mani&egrave;re passive ou active, et ils ont connect&eacute; chaque r&eacute;ponse &agrave; une voie neuronale particuli&egrave;re dans le cerveau.<\/span><\/span><\/span><\/span><br style=\"box-sizing:border-box; line-height:4.6rem; display:inline-block; font-variant-ligatures:normal; text-align:start; text-decoration-thickness:initial; text-decoration-style:initial; text-decoration-color:initial; margin-top:15px; margin-right:15px; margin-bottom:15px; margin-left:15px\" \/><br \/>\n<span style=\"line-height:107%\"><span style=\"color:black\"><span style=\"letter-spacing:.4pt\"><span style=\"background:white\">Dans une exp&eacute;rience diff&eacute;rente, les chercheurs ont r&eacute;ussi &agrave; modifier le circuit neuronal, obligeant les rats &agrave; surmonter ce qui aurait &eacute;t&eacute; une r&eacute;action paralysante &agrave; une menace et &agrave; r&eacute;agir de mani&egrave;re agressive &agrave; la place.<\/span><br style=\"box-sizing:border-box; line-height:4.6rem; display:inline-block; font-variant-ligatures:normal; text-align:start; text-decoration-thickness:initial; text-decoration-style:initial; text-decoration-color:initial; margin-top:15px; margin-right:15px; margin-bottom:15px; margin-left:15px\" \/><br \/>\n<span style=\"background:white\">Il est important d&#39;&eacute;tablir le lien et la fa&ccedil;on dont Le circuit neuronal r&eacute;gule le stress, en raison des effets connus du stress chronique sur la sant&eacute; physique et mentale.<\/span><br style=\"box-sizing:border-box; line-height:4.6rem; display:inline-block; font-variant-ligatures:normal; text-align:start; text-decoration-thickness:initial; text-decoration-style:initial; text-decoration-color:initial; margin-top:15px; margin-right:15px; margin-bottom:15px; margin-left:15px\" \/><br \/>\n<span style=\"background:white\">&quot;De nombreuses maladies de stress chroniques comme la d&eacute;pression et les troubles anxieux sont associ&eacute;es &agrave; ce que nous appelons un comportement d&#39;adaptation passif&quot;, explique Jason Radley, professeur agr&eacute;g&eacute; au D&eacute;partement des sciences psychologiques et c&eacute;r&eacute;brales et auteur correspondant de l&#39;&eacute;tude.&nbsp;<br \/>\n&quot;Nous savons que bon nombre de ces conditions sont caus&eacute;es par le stress de la vie. La raison la plus simple pour laquelle nous nous int&eacute;ressons &agrave; cette voie est de la consid&eacute;rer comme un circuit qui peut favoriser la r&eacute;silience contre le stress&quot; a-t-il ajout&eacute;.<\/span><br \/>\n<span style=\"background:white\">Selon des &eacute;tudes ant&eacute;rieures, une voie importante contr&ocirc;lant la fa&ccedil;on dont les animaux r&eacute;agissent au stress est le cortex pr&eacute;frontal m&eacute;dial caudal-m&eacute;senc&eacute;phale gris p&eacute;riaqueducal dorsolat&eacute;ral. En d&eacute;sactivant cette voie, puis en observant comment les rats r&eacute;agissaient &agrave; une menace, l&#39;&eacute;quipe de Radley a pu d&eacute;montrer son importance.<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom: 11px; text-align: justify;\"><span style=\"font-family:Arial,Helvetica,sans-serif;\"><span style=\"font-size:14px;\"><span style=\"line-height:107%\"><span style=\"background:white\"><span style=\"line-height:107%\"><span style=\"color:black\"><span style=\"letter-spacing:.4pt\">Les rats peuvent r&eacute;agir de deux mani&egrave;res : L&#39;une passivement, ce qui signifie essentiellement qu&#39;ils n&#39;ont pas r&eacute;agi au danger.&nbsp;L&#39;autre affiche activement une vari&eacute;t&eacute; de comportements, comme &eacute;viter le danger, se tenir debout sur leurs pattes arri&egrave;res ou chercher une issue.<\/span><\/span><\/span><\/span><br style=\"box-sizing:border-box; line-height:4.6rem; display:inline-block; font-variant-ligatures:normal; text-align:start; text-decoration-thickness:initial; text-decoration-style:initial; text-decoration-color:initial; margin-top:15px; margin-right:15px; margin-bottom:15px; margin-left:15px\" \/><br \/>\n<span style=\"line-height:107%\"><span style=\"color:black\"><span style=\"letter-spacing:.4pt\"><span style=\"background:white\">Les scientifiques ont d&eacute;couvert que les rats r&eacute;pondaient passivement ou sans r&eacute;agir directement &agrave; la menace lorsque le circuit neuronal de stress &eacute;tait d&eacute;sactiv&eacute;.<\/span><br style=\"box-sizing:border-box; line-height:4.6rem; display:inline-block; font-variant-ligatures:normal; text-align:start; text-decoration-thickness:initial; text-decoration-style:initial; text-decoration-color:initial; margin-top:15px; margin-right:15px; margin-bottom:15px; margin-left:15px\" \/><br \/>\n<span style=\"background:white\">&quot;Cela montre que cette voie est n&eacute;cessaire pour un comportement d&#39;adaptation actif&quot;, a d&eacute;clar&eacute; Radley.<\/span><br style=\"box-sizing:border-box; line-height:4.6rem; display:inline-block; font-variant-ligatures:normal; text-align:start; text-decoration-thickness:initial; text-decoration-style:initial; text-decoration-color:initial; margin-top:15px; margin-right:15px; margin-bottom:15px; margin-left:15px\" \/><br \/>\n<span style=\"background:white\">En retirant la liti&egrave;re des cages des rats, ce qui les emp&ecirc;che de tenter d&#39;enterrer le m&eacute;canisme de menace, les chercheurs ont ensuite forc&eacute; les rats &agrave; r&eacute;agir passivement.&nbsp;Les rats ont chang&eacute; leur comportement et ont activement r&eacute;agi &agrave; la menace lorsque l&#39;&eacute;quipe a activ&eacute; la voie neuronale.&nbsp;M&ecirc;me si les animaux ont &eacute;t&eacute; laiss&eacute;s sans leur liti&egrave;re, ce qui aurait d&ucirc; provoquer une r&eacute;ponse passive, la r&eacute;action active a quand m&ecirc;me eu lieu.&nbsp;<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom: 11px; text-align: justify;\"><span style=\"font-family:Arial,Helvetica,sans-serif;\"><span style=\"font-size:14px;\"><span style=\"line-height:107%\"><span style=\"background:white\"><span style=\"line-height:107%\"><span style=\"color:black\"><span style=\"letter-spacing:.4pt\">De plus, des tests sanguins effectu&eacute;s avant et apr&egrave;s l&#39;activation des circuits neuronaux des rats ont r&eacute;v&eacute;l&eacute; que leurs niveaux de cortisol, l&#39;hormone du stress, n&#39;augmentaient pas en pr&eacute;sence de la menace.<\/span><\/span><\/span><\/span><br style=\"box-sizing:border-box; line-height:4.6rem; display:inline-block; font-variant-ligatures:normal; text-align:start; text-decoration-thickness:initial; text-decoration-style:initial; text-decoration-color:initial; margin-top:15px; margin-right:15px; margin-bottom:15px; margin-left:15px\" \/><br \/>\n<span style=\"line-height:107%\"><span style=\"color:black\"><span style=\"letter-spacing:.4pt\"><span style=\"background:white\">&quot;En activant la voie, nous avons constat&eacute; de larges effets de r&eacute;duction du stress&quot;, explique Radley.&nbsp;&quot;Cela a non seulement raviv&eacute; les comportements d&#39;adaptation actifs des rats, mais les a &eacute;galement restaur&eacute;s et a consid&eacute;rablement r&eacute;duit la lib&eacute;ration d&#39;hormones de stress.&quot;<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p style=\"margin-bottom: 11px; text-align: justify;\">\n<span style=\"font-family:Arial,Helvetica,sans-serif;\"><span style=\"font-size:14px;\"><span style=\"line-height:107%\"><span style=\"line-height:107%\"><span style=\"color:black\"><span style=\"letter-spacing:.4pt\"><span style=\"background:white\">Dans la troisi&egrave;me s&eacute;rie de tests, les chercheurs ont expos&eacute; des rats &agrave; un stress variable chronique, qui impliquait une exposition quotidienne au stress sur une p&eacute;riode de deux semaines.&nbsp;Apr&egrave;s cette p&eacute;riode de conditionnement, les rats ont &eacute;t&eacute; log&eacute;s dans des cages et menac&eacute;s.&nbsp;Comme les chercheurs l&#39;avaient pr&eacute;dit, ils ont r&eacute;agi de mani&egrave;re passive et immobile et leurs niveaux d&#39;hormones de stress ont augment&eacute;.<\/span><br style=\"box-sizing:border-box; line-height:4.6rem; display:inline-block; font-variant-ligatures:normal; text-align:start; text-decoration-thickness:initial; text-decoration-style:initial; text-decoration-color:initial; margin-top:15px; margin-right:15px; margin-bottom:15px; margin-left:15px\" \/><br \/>\n<span style=\"background:white\">Selon Radley, les humains subissent un stress chronique et certaines personnes continuent de porter ces charges pour des raisons inconnues, ce qui peut entra&icirc;ner des troubles physiques et mentaux.&nbsp;D&#39;autres, cependant, pr&eacute;sentent peu ou pas de souvenirs du stress du pass&eacute;.&nbsp;Ce comportement est connu sous le nom de &quot;r&eacute;silience au stress&quot; par les chercheurs.<\/span><\/span><\/span><\/span><\/span><\/span><\/span><br style=\"box-sizing:border-box; line-height:4.6rem; display:inline-block; font-variant-ligatures:normal; text-align:start; text-decoration-thickness:initial; text-decoration-style:initial; text-decoration-color:initial; margin-top:15px; margin-right:15px; margin-bottom:15px; margin-left:15px\" \/><br \/>\n&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nous avons tous subi les effets paralysants d&#39;un danger ou d&#39;une menace &agrave; un moment donn&eacute;. Des chercheurs de l&#39;Universit&eacute; de l&#39;Iowa ont d&eacute;termin&eacute; l&#39;origine de cette r&eacute;ponse &agrave; une&hellip;<\/p>\n","protected":false},"author":112,"featured_media":239292,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2515],"tags":[],"class_list":["post-277775","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sante"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La recherche montre comment le stress affecte le cerveau - R\u00e9alit\u00e9s Magazine<\/title>\n<meta name=\"description\" content=\"Nous avons tous subi les effets paralysants d&#039;un danger ou d&#039;une menace &agrave; un moment donn&eacute;. 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